The security at the Chennai Airport has been tightened following a hijack threat call which was received on Sunday. According to the information received, the hijack will be carried out by a team of 23 people, which have led the security agencies to put other airports on high alert.

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According to sources, an email was sent by a woman who overheard 6 boys discussing a plan to simultaneously carry out hijacks from Mumbai, Chennai and Hyderabad airports.

Meanwhile, CISF jawans are patrolling the airport premises with loaded weapons, and Central Intel has also received a tip that terrorist organizations might attempt to hijack an airplane.

A similar hijack attempt was made in London-bound Air India flight in January 2015. the Central Industrial Security Force or CISF, which is in charge of security at the country's airports, had reviewed its procedures. Anti-hijack drills were held at airports and communication lines with the police and security agencies were also checked.